List of Hot 100 number-one singles of 2015 (Japan)
# List of Hot 100 number-one singles of 2015 (Japan)

This is a list of number one singles on the Billboard Japan Hot 100 chart in Japan in 2015. The week's most popular songs in Japan, ranked by the Hanshin Corporation and based on radio airplay measured by Plantech and sales data as compiled by SoundScan Japan.

## Chart history

| Issue date | Song | Artist(s) |
| - | - | - |
| January 12 | "Thank You Jan!" | Kis-My-Ft2 |
| January 19 | "Kaguya" | News |
| January 26 | "Uchōten" | B'z |
| February 2 | "Dead or Alive" | KAT-TUN |
| February 9 | "Guilty Love" | 2PM |
| February 16 | "Zundoko Paradise" | Johnny's West |
| February 23 | "Kioku" | Subaru Shibutani |
| March 2 | "Karei naru Gyakushuu" | SMAP |
| March 9 | "Sakura" | Arashi |
| March 16 | "Green Flash" | AKB48 |
| March 23 | "Kiss Kiss Kiss" | KAT-TUN |
| March 30 | "Inochi wa Utsukushii" | Nogizaka46 |
| April 6 | "Kiss Tamashii" | Kis-My-Ft2 |
| April 13 | "Don't look back!" | NMB48 |
| April 20 | "Maji Love Revolutions" | ST☆RISH |
| April 27 | "Starting Over" | Sandaime J Soul Brothers from Exile Tribe |
| May 4 | "Hello, World!" | Bump of Chicken |
| May 11 | "Chau#" | Hey! Say! JUMP |
| May 18 | "Timeless" | V6 |
| May 25 | "Aozora no Shita, Kimi no Tonari" | Arashi |
| June 1 | "Bokutachi wa Tatakawanai" | AKB48 |
| June 8 | "Sugar Song & Bitter Step" | Unison Square Garden |
| June 15 | "The Strongly Strongly strongly" | Kanjani Eight |
| June 22 | "Red" | B'z |
| June 29 | "For You" | BTS |
| July 6 | "Chumuchumu" | News |
| July 13 | "Angelic Angel" | μ's |
| July 20 | "Summer Madness" | Sandaime J Soul Brothers from Exile Tribe featuring Afrojack |
| July 27 | "Bokutachi wa Hitotsu no Hikari" | μ's |
| August 3 | "Taiyō Nokku" | Nogizaka46 |
| August 10 | "Bari Hapi" | Johnny's West |
| August 17 | "Maemuki Scream!" | Kanjani Eight |
| August 24 | "Mae Nomeri" | SKE48 |
| August 31 | "Kimi ga Kureta Natsu" | Leo Ieiri |
| September 7 | "Halloween Night" | AKB48 |
| September 14 | "Ai o Sakebe" | Arashi |
| September 21 | "Otherside" | SMAP |
| September 28 | "Torisetsu" | Nishino Kana |
| October 5 | "SOS" | Sekai no Owari |
| October 12 | "Shin Takarajima" | Sakanaction |
| October 19 | "Must be now" | NMB48 |
| October 26 | "AAO" | Kis-My-Ft2 |
| November 2 | "Kimi Attraction" | Hey! Say! JUMP |
| November 9 | "Ima, Hanashitai Dareka ga Iru" | Nogizaka46 |
| November 16 | "Love Me Right〜romantic universe〜" | Exo |
| November 23 | "Saigo mo Yappari Kimi" | Kis-My-Ft2 |
| November 30 | "Christmas Song" | Back Number |
| December 7 | "Christmas Song" | Back Number |
| December 14 | "Samurai Song" | Kanjani Eight |
| December 21 | "Kuchibiru ni Be My Baby" | AKB48 |
| December 28 | "Colorful Eyes" | Sexy Zone |
